Software development guide advises freezing test outputs before refactoring code

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A software development article outlines a method for safely refactoring legacy code. The approach involves first creating a set of nine synthetic test cases that define expected outputs. These test cases must pass before any code changes are made to ensure behavior is preserved. The article uses a specific function that maps payment webhook payloads as a concrete example. This technique aims to prevent accidental introduction of bugs during code maintenance.

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